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Customizing your Account

  • Updated on 08 Oct 2018
  • 7 minutes to read

Index Interest Rates

It's a common practice in some organisations to fix their internal interest rates to a standard rate determined periodically by an external entity, such as Central Banks.

The interest rate source is defined when creating a Loan Product using declining balance methods as explained in Interest Calculation Methods in Loans.

All the accounts created under a loan product using Index Interest Rate will be reviewed at a frequency which is also determined when creating the product.

When the accounts are reviewed, if the Index Rate remains the same, there will be no changes in the repayment schedules. On the other hand, if the Index Rate changed after the latest review, the repayment schedules will be updated to reflect the new interest rate.

Adding an Index Interest Rate

To add an Index Interest Rate you have to add first a Rate Source. Available Rate Sources: Interest Rate, Value Added Tax, Withholding Tax. 

  1. Go to Administration

  2. General

  3. Rates

  4. Add Index Interest Rate

  5. Enter the rate and the start date

  6. Save Changes


There are a few aspects to take into account when adding a new index Interest Rate:

  • The first Index rate can be added with a start date in the past

  • All other Index rates should have either the current or a future date

Editing and deleting an Index Interest Rate

Index Rates can only be edited or deleted if the start date is either the current or a future date, or if it is not being used in any account yet.


To edit an Index rate click on the correspondent icon > edit the Index rate > Save Changes.

To delete an Index rate click on the delete icon > Delete.

Transaction Channels

In addition to the four predefined Transaction Channels--Cash, Receipt, Check and Bank-- you can add others if your organisation uses other payment forms, such as POS devices. In order to use transaction channels only for specific transactions or products, you can set Loan Constraints and Savings Constraints. The constraints are based on transaction type (Disbursement and Repayment in case of Loan Constraints and Deposit and Withdrawal in case of Deposit Constraints), Product (Loan/Deposit) and Amount.

When adding a new Transaction Channel, you can define which fields should be available as well as the Fund Source GL Account to which that channel should be linked. This will allow you to log different journal entries depending on which payment method you use while keeping your books updated.

To add new transaction channels:

  1. Go to General

  2. Transaction Channels

  3. Add Channel

  4. Enter name and ID

  5. Choose the GL account to be linked to that channel

  6. Add Loan Constraints/Savings Constraints

  7. Check the user roles that should be able to post transactions using that channel

  8. Save Changes


The new Transaction Channel will be added to the list and available when you enter any transaction.

Please Note
When users are posting transactions they will only see the channels that are available for their role.

Editing, Deactivating and Deleting Transaction Channels

If you need to make any changes to an existing transaction channels, you'll find the option to edit under Actions and you'll be able to do the changes.

Please be Aware
If you need to change the GL Account on a Transaction Channel already in use, you should make sure that you reflect the changes with manual Journal Entries.

Under Actions you will also find the options to Delete or Deactivate a Transaction Channel. You can only delete channels that haven't been used before. If a channel has been used before but you don't want it to be available anymore, you can simply deactivate it and users won't be able to see it as an option when logging a transaction.

Rearranging Channels

You can define in which order the Transaction Channels will be displayed to users so that the most used ones are on top of the list, for example.

To rearrange the existing channels:

1.Go to General Settings

2.Transaction Channels


4.Drag and drop the channels in the order you want

5.Save Changes

Tax Rates

Organisations might be required to collect taxes on the income generated from loans interest, fees or penalties, and/or to withhold taxes on interest paid to deposit accounts. These taxes are usually called Value Added Tax (VAT) in the case of Loan Products, and Withholding Taxes in the case of Deposit products. 

Please Note
Taxes are set up at the Product Level, using a previously defined Tax Rate. For Tax details, please see the relevant sections in the Loan Product Setup and Deposit Product Setup articles.

Adding a Tax Rate

Just as it happens with the Index interest rates, also taxes source, rates and start date need to be added under Administration before being used.

The first step should be to add the tax source. To do so go to Administration > General Settings > Rates > click the plus icon > enter the source's name > choose the Rate Source Type > Save Changes.


Once the tax source is defined, you can start defining your Taxes rates. Choose the appropriate Tax source > click "Add Vaule Added Tax" or "Add Witholding Tax"> enter the new rate > enter the date when it should be valid from > Save Changes.


Please Note
Taxes can't be enabled or disabled on a product if it already has active accounts.

Custom Labels

Depending on your activities or internal policies, you might use a different terminology to refer to your clients or offices for instance.

To continue using that same internal terminology while working with Mambu, the default labels can be changed to accommodate your own.

The default labels that can be changed are Clients, Groups, Branches, Centres, Credit Officers, Interest and Fees.

To change the default labels in Mambu:

  1. Go to Administration

  2. General Settings

  3. Labels > Labels

  4. Click on Actions

  5. Edit > enter the new labels in both singular and plural forms

  6. Save Changes

You will see the new labels immediately after saving the changes.



If some users in your organization are using Mambu in a different language, you can define the labels for them too. Just choose the language from the menu > enter the labels as described above.

Group Roles

Some groups determine specific roles for some of its members. One member can be responsible, for example, for collecting the repayments' money from all the other members and taking it to the institution on the due date. This member's role could then be defined as the treasurer of the group.

Knowing which members are responsible for certain tasks can be relevant in cases when for some reason the group is assigned to another credit officer in your organization, or if some other staff member has to take over the transactions of that group for a certain period of time.

To define new roles go to Administration > General Settings > Group Roles > click on Add New Group Role Name > enter the name > Save Changes when you finnish adding all the group roles.


Client Types

In Mambu you can setup different Client Types, based on your organisation's needs. 

You can define a name and ID for the client type and select from several usage options:


Allow opening accounts - when checked, new accounts for this client type can be created

Allow as guarantor - when checked, the clients under this type can be used as guarantors

Require identification documents - when checked, ID details must be provided for the client to be created

Show default address fields - when checked, the Mambu default address section will be available*

Please Note
Mambu's default address has the standard fields, however some organisations might require capturing more fields or additional data relating to client addresses. Therefore the default address can be disabled, so that a new address section can be created via Custom Fields (see article here).

Please be Aware
Only the default address can be used for GPS location on the Mobile App. If this is needed by your organisation, you must use the default address.